LTRE {popbio} | R Documentation |
Function to evaluate sensitivities in a fixed Life Table Response Experiment (LTRE).
LTRE(trts, ref)
trts |
A treatment matrix or a list of two or more treatment matrices |
ref |
A reference matrix |
Sensitivities are evaluated midway between the treatment and reference matrices as described in section 10.1.1 in Caswell (2001).
A matrix of contributions (equation 10.4 in Caswell) or a list of matrices with one matrix of contributions per treatment
The examples of a fixed LTRE are from
Horvitz, C. C., D. W. Schemske, and H. Caswell. 1997. The relative importance of life-history stages to population growth: prospective and retrospective analyses. Pages 247-271 in S. Tuljapurkar and H. Caswell, editors. Structured population models in marine, terrestrial and freshwater systems. Chapman and Hall, New York.
A.L. Angert. 2006. Demography of central and marginal populations of monkeyflowers (Mimulus cardinalis and M. lewisii). Ecology 87:2014-2025.
Check the demo(Caswell)
for variance decomposition in a random
design using killer whale.
Chris Stubben
Caswell, H. 2001. Matrix population models: construction, analysis, and interpretation, Second edition. Sinauer, Sunderland, Massachusetts, USA.
####### Calathea ovandensis data(calathea) calathea_pool<-calathea[['pooled']] ## Create plots like FIGURE 7 in Horvitz et al 1997 ##PLOTS plots<- split(calathea[-17], rep(1:4,each=4)) ## use Mean matrix since pooled not available by plot plots<- lapply(plots, mean) Cm<-LTRE(plots, calathea_pool) pe<-sapply(Cm, sum) barplot(pe, xlab="Plot", ylab="Plot effect" , ylim=c(-.25, .25), col="blue", las=1) abline(h=0) box() title(expression(italic("Calathea ovandensis"))) ##YEARS -- split recycles vector yrs<-split(calathea[-17], 1:4) yrs <- lapply(yrs, mean) names(yrs)<-1982:1985 Cm<-LTRE(yrs, calathea_pool) ye<-sapply(Cm, sum) barplot(ye, xlab="Year", ylab="Year effect" , ylim=c(-.25, .25), col="blue", las=1) abline(h=0) box() title(expression(italic("Calathea ovandensis"))) ## INTERACTION Cm<-LTRE(calathea[-17], calathea_pool) ie<-sapply(Cm, sum) ## minus plot, year effects ie<- ie - rep(pe, each=4) - rep(ye, 4) names(ie)<-NULL names(ie)[seq(1,16,4)]<-1:4 barplot(ie, xlab="Plot (years 82-83 to 85-86)", ylab="Interaction effect" , ylim=c(-.25, .25), col="blue", las=1) abline(h=0) box() title(expression(italic("Calathea ovandensis"))) ####### Mimulus ## Pooled M. cardinalis reference matrix kindly provided by Amy Angert 1/2/2008. m_card_pool<-matrix( c( 1.99e-01, 8.02e+02, 5.82e+03, 3.05e+04, 2.66e-05, 7.76e-02, 2.31e-02, 1.13e-03, 7.94e-06, 8.07e-02, 3.22e-01, 2.16e-01, 2.91e-07, 1.58e-02, 1.15e-01, 6.01e-01), byrow=TRUE, nrow=4) ## Population effects using pooled population matrices data(monkeyflower) card<-subset(monkeyflower, species=="cardinalis" & year=="pooled") ## split rows into list of 4 matrices Atrt<-lapply(split(as.matrix(card[,4:19]), 1:4), matrix, nrow=4, byrow=TRUE) names(Atrt)<-card$site Cm<-LTRE(Atrt, m_card_pool) x<-sapply(Cm, sum) x names(x)<-c("BU", "RP", "WA", "CA") ## Plot like Figure 2A in Angert (2006) op<-par(mar=c(5,5,4,1)) barplot(x, xlab="Population", ylab="" , ylim=c(-.4, .4), xlim=c(0,6.5), las=1, space=.5, col="blue") abline(h=0) mtext(expression(paste(sum(a[ij]), " contributions")), 2, 3.5) title(expression(paste(italic("M. cardinalis"), " Population effects"))) box() ## and Plot like Figure 3A x<-matrix(unlist(Cm), nrow=4, byrow=TRUE) colnames(x)<-paste("a", rep(1:4, each=4), 1:4, sep="") bp<-barplot(x[1:2,], beside=TRUE, ylim=c(-.2,.2), las=1, xlab="Transition", ylab="", xaxt='n') mtext(expression(paste("Contribution of ", a[ij], "to variation in ", lambda)), 2, 3.5) ## rotate labels text(bp[1,]-0.5, -.22, labels=colnames(x), srt=45, xpd=TRUE) title(expression(paste(italic("M. cardinalis"), " Range center"))) box() par(op)